Abstract
We have used an original modulation technique to measure longitudinal (spin-lattice) relaxation time T 1 in stable and metastable phases of RbC 60 at 77 – 450K. The data are correlated with transverse relaxation time T 2 and spin susceptibility measured in the wide temperature range. The equality T 1 = T 2 is found to be valid both in the stable polymer (ortho-I) and fcc phases. In quenched samples, two different T 1 values are found below 140K, one of them being much longer than T 2. Interpretation is suggested implying quasi 1D metal behavior in the polymer phase and localized paramagnetic centers with exchange interaction in the others.
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